China is vowing to crackdown on the illegal planting of GMO crops after it was revealed that a spy stole millions of dollars' worth of proprietary corn seeds produced by DuPont Pioneer and Monsanto.

The Chinese-born U.S. citizen, Mo Hailong, has confessed to leading a group that swiped the seeds. Mo had been the director of Dabeinong Technology (DBN) Group, a Beijing-based agricultural tech firm, and is also the brother-in-law of the company's founder.